An Energy-Efficient Readout Method for Piezoresistive Differential Pressure Sensors

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An Energy-Efficient Readout Method for Piezoresistive Differential Pressure Sensors

Conference Paper (2017)

Author(s)

Hui Jiang (TU Delft - Electrical Engineering, Mathematics and Computer Science)

Kofi A.A. Makinwa (TU Delft - Electrical Engineering, Mathematics and Computer Science)

Stoyan Nihitanov (TU Delft - Electrical Engineering, Mathematics and Computer Science)

Department

Microelectronics

Energy-efficient Wheatstone bridge Low noise power density Continuous time sigma delta modulator

DOI related publication

https://doi.org/10.1109/IECON.2017.8216736 Final published version

To reference this document use

https://resolver.tudelft.nl/uuid:a9a4efa3-e7a0-45e1-84d0-b8e90e469f5a

More Info

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Publication Year

2017

Language

English

Department

Microelectronics

Pages (from-to)

4287-4291

ISBN (electronic)

978-1-5386-1127-2

Event

IECON 2017 (2017-10-29 - 2017-11-01), Beijing, China

Downloads counter

185

Abstract

This paper describes a low power and low noise circuit for resistive Wheatstone bridge sensor readout. The proposed readout exploits the bridge configuration of the sensor by embedding it into a second-order continuous-time sigma delta modulator (RC CTΔΣM). By directly digitizing the output signal of a Wheatstone bridge in the current mode, the noise performance is dominated by the operational transconductance amplifier (OTA) in the first integrator. The proposed readout is designed in a 0.35 μm CMOS technology. Simulation results show that it achieves an input referred noise power spectral density (PSD) of 4.2 nV/√Hz with a current consumption of 860 μA from a 5 V voltage supply. This represents a noise efficiency factor (NEF) of 4.7.